carbon dating of fossils older than 10,000 years

heartless

Hello,
I'm just wondering, is it fine to predict the age of fossils older than 10,000 years with Carbon Datin? After all, I think nobody knows how much carbon-14 there was back then, and whether the animals consumed less or more carbon-14 than now. How exact are such long-term predictions?

Mk

http://www.ingentaconnect.com/conten...00002/art00008

ca60,000 years is pretty much the limit

See: http://en.wikipedia.org/wiki/Radioca...ng#Calibration

GeekyGuy

Anything older you'll need to use potassium-40.